Perf tracing disruption via oversized DMA arrays
Published Mar 25, 2026 · Updated Mar 25, 2026
Buffer overflow in Linux Kernel 6.12 through 6.18.12 allows local users to disrupt perf tracing via large scatter-gather lists. The dma_map_sg tracepoint sizes its phys_addrs, dma_addrs, and lengths arrays from nents, so lists above 1,000 entries produce an event around 20 KB that exceeds the 8,192-byte perf trace limit. Low-privileged local access and active perf tracing are required; the observed consequence is a kernel warning that the perf buffer is too small, not a demonstrated kernel crash.
Summary
What happened
Buffer overflow in Linux Kernel 6.12 through 6.18.12 allows local users to disrupt perf tracing via large scatter-gather lists. The dma_map_sg tracepoint sizes its phys_addrs, dma_addrs, and lengths arrays from nents, so lists above 1,000 entries produce an event around 20 KB that exceeds the 8,192-byte perf trace limit. Low-privileged local access and active perf tracing are required; the observed consequence is a kernel warning that the perf buffer is too small, not a demonstrated kernel crash.
The record
- CVE
- CVE-2026-23390
- Published
- Mar 25, 2026
- Updated
- Mar 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-787, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 25, 2026CVE publishedPublication date reported by the CVE source.
- Mar 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=038eb433dc1474c4bc7d33188294e3d4778efdfd <02d209bb018a40dee9eac89e91860253dee9605b
- Affected versionversion=038eb433dc1474c4bc7d33188294e3d4778efdfd <daafcc0ef0b358d9d622b6e3b7c43767aa3814ee
- Affected versionversion=038eb433dc1474c4bc7d33188294e3d4778efdfd <f2584f791a10343bdc995ff6ff402db45b95de69
- Affected versionversion=6.12
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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